--- old/src/cpu/zero/vm/assembler_zero.cpp	2012-12-06 10:31:36.830033084 -0800
+++ new/src/cpu/zero/vm/assembler_zero.cpp	2012-12-06 10:31:36.382311298 -0800
@@ -66,8 +66,7 @@
 }
 
 void MacroAssembler::advance(int bytes) {
-  _code_pos += bytes;
-  sync();
+  code_section()->set_end(code_section()->end() + bytes);
 }
 
 RegisterOrConstant MacroAssembler::delayed_value_impl(